"Our girls, we kept them inside for the few days because they said they saw a strange guy walking around," Galoff said.

Hales Corners police arrested a 30-year-old Waukesha man after a neighbor spotted his BMW parked nearby. WISN 12 News has learned he has a record dating back nearly a decade for the same offense.

In 2005, LaCrosse police charged him with exposing genitals to a minor. Because he was a first-time offender, a judge dismissed the case for staying out of trouble.

In 2007, Cudahy police arrested the suspect and ticketed him for lewd and lascivious behavior after two teenage girls reported he had flashed them near Cudahy High School.

In 2011, Hales Corners arrested him for the first time, accused of flashing two 15-year-olds blocks from the May flashing incident. Despite that record, WISN 12 News has learned that suspect was never charged in the most recent case. Police said the girls couldn't identify him in a lineup.

No one answered at the suspect's Waukesha county home Monday afternoon.

Galoff said she worries the man could become more dangerous.

"Obviously, the flashing is not going to be enough for him eventually if he keeps doing it," Galoff said.

She said her younger sisters have been warned.

Police said the suspect hired a lawyer, who enrolled him in a treatment program.